Compact wire fabric



July 17, 1956 H. HENKE 2,755,047

colvfmrr WIRE FABRIC Filed March 11, 1953 /NVENro/Q. Hel/2j Henke ByvmATTYS.

United States Patent Olice 2,755,047 Patented July 17, 1956 COMPACT WIREFABRIC Heinz Henke, Duren, Rhineland, Germany Application March 11,1953, Serial No. 341,739

Claims priority, application Germany March 15, 1952 1 Claim. (Cl. 24S-8)The invention relates to a wire fabric, particularly to the productionof an extremely compact fabric.

Extremely compact lter fabrics have until now been produced in such amanner that the transversely extending weft wires have been wovenclosely and without any distance from one another. As the transversalwires have to bend around the warp wires, that is the longitudinalwires, those longitudinal wires may be arranged only in such a distancefrom one another which amounts to a multiple of their thickness.Moreover the longitudinal wires are not allowed to exceed a certainsmall diameter as otherwise the weft wires are not able to stand theelongation arising in weaving and break. If as a compensation the weftWires would be made thicker, either the warp wire would break or nocompact fabric could be obtained, as the weft wires could no more bewoven closely side by side because in this case the Warp Wires insteadof the weft wires would have to bend around the latter and would hinderthe reciprocal contact of the weft wires.

The disadvantage of the compact wire fabrics produced until now consistsin the too small number and the small thickness of the longitudinalwires. For this reason the usual compact fabrics are considerably lessdurable in longitudinal direction than in transverse direction. Thelongitudinal wires break when tensioning the fabric and its compactnessis diminished when any stress is put upon the fabric because thereby thelongitudinal wires are elongated and the transversal wires aredisplaced.

This invention has for its object a Wire fabric in which thesedisadvantages are eliminated. The essential feature of the fabricaccording to the invention consists therein that the longitudinal wireslie closely side by side in reciprocal contact and are bent around thetransversal wires. That means that no more the transversely extendingweft wires, but the longitudinally extending warp wires are wovenclosely side by side, whereby the warp Wires are bent one after anotheralternatively around the weft wires. In this production of a compactfabric the longitudinal wires may be bent in any degree of steepnessaround the transversal wires without the danger of a break arising. Thisresults from the fact that the longitudinal Wires are able to derivefrom the warp beam the wire length necessary for the bends effected oneafter another.

The development of the compact wire fabric according to the inventionmakes it possible that any degree of thickness of the transversal wiremay be chosen. The thickness of the transversal wires may exceed that ofthe longitudinal wires. The diameter of the transversal wires may forexample amount to a multiple of the diameter of the longitudinal wires.Adequately to such a strengthening of the transversal wires a fabric isobtained which is able to show in both directions of the fabric sucienttearing strength.

The development according to the invention further makes it possible toarrange the transversal wires at any distance from one another,particularly at such small distance that the distance of the transversalWires from one another corresponds to the diameter of the bent aroundlongitudinal wires. In this case a completely closed fabric is obtainedwhose compactness can no more be increased. Such kind of fabric combinesthe highest possible density of filtration with great mechanicalstrength.

ln the drawing is illustrated one embodiment of the invention.

Fig. l shows a section through the fabric of the instant invention whentaken along lines I--I of Fig. 2; and

Fig. 2 is another sectional view of the fabric of the instant invention.

Contrary to the usual manner of production of compact wire fabrics, thelongitudinally extending warp wires 1 are bent around the transversallyextending weft wires 2 and the longitudinal wires 1 are able to contactone another immediately. Thereby the thickness of the weft wires may beconsiderably greater than that of the longitudinal wires.

ln Figs. l and 2 is illustrated a fabric having theoretically thehighest possible density. In this fabric not only the longitudinal wires1 lie side by side contacting one another immediately, but also thetransversal wires 2 are arranged closely side by side in such a mannerthat the distance between two weft wires corresponds to' the diameter ofthe interwoven longitudinal wires. The longitudinal wires are twistedaround the weft wires over an angle of In this case the surface of thefabric is closed with the exception of the geometrically calculableopenings 3 between the cross sections or" the closely lying longitudinalwires and the weft wires which are separating them. According to thechosen thickness of the longitudinal and weft wires, the finest densityof filtration may be obtained together with great mechanical strength ofthe fabric. An illustrative example of a very line ltering fabric may beindicated by preparing a filter consisting of very line warp wires whosediameter does not exceed 0.04 mm., With the diameter of the weft Wiresbeing, for example, double multiple of the warp wire as gurativelyillustrated in the drawings.

The extremely compact fabric according to the invention may be used formost different purposes. The compact fabric is particularly well suitedas a sieve for paper-making machinery and as a filter fabric generally.

I claim:

A closely woven compact wire lilter fabric and the like consisting of aplurality of slightly and uniformly separated transverse weft wires,each of said weft wires comprising an undeformed, single and integralstrand of wire of uniform diameter and single strands of longitudinallyextending warp wires arranged in alternate side by side contiguousrelationship woven one up and one down over and under succeeding weftwire strands in a wrapped around relationship, the diameter of each ofsaid single stranded weft wires also being a multiple of the diameter ofa warp wire strand, and said Wrapped portions of the warp strands alsobeing so located intermediate adjacent weft Wire strands `that the saidwrapped warp portions are disposed substantially perpendicular to thenormal plane of the fabric, with the adjacent weft strands in turn beingseparated from each other only by a distance substantially equal to thediameter of a warp strand.

References Cited in the tile of this patent UNITED STATES PATENTS1,017,662 Franck Feb. 20, 1912 1,147,279 Sweetland July 20, 19151,337,053 Dreyling et al. Apr. 13, 1920 2,122,592 Specht July 5, 1938

